Rayhunter is a project for detecting IMSI catchers, also known as cell-site simulators or stingrays. Why the Electronic Frontier Foundation established the project is explained at the site. Is this useful for the average person? Not really, but it was fun for me.
The device used initially is the Orbic Speed (RC400L), a small Internet hotspot. I found one on eBay for just $15 including shipping. Other devices have been added to the supported device list.
Installation is pretty straightforward. Download the installer that matches your computer, connect the device to your computer with a USB cable and launch the installer per the instructions.
A successful installation will show a green bar across the top of the screen and the presence of "stingrays" when you drive around will display yellow dots, orange dashes, or a solid red line. The device will log the data which you may share with the EFF.
How do you manage the device? There is a web UI at http://192.168.1.1:8080

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